Malicious PDF — malware analysis report

Static analysis result for SHA-256 2229dcd449644828…

MALICIOUS

PDF

86.7 KB Created: 2021-09-11 03:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 96f08b1feff3816af9b930d98df44d65 SHA-1: 48271e12061cad5e892ae361787f76a10a56d53a SHA-256: 2229dcd4496448285d7b0a716fb3e5089b8815e43dac215197d51734634bc248
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c67419142---volako.pdf In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f7034e51a---8584990540.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/35050857165.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff83180a0---81622985066.pdfIn PDF document text
    • http://ihdbd.org/upload/files/76781694995.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613046cdaafd8---gemifano.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/mewiwoguzesatulosixewif.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/69508404511.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/4742599803.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/nutezilit.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/ponaralixizironipupafu.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/regubawogezodarawopos.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/gabowujub.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/muwokixojufoku.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/12228020762.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/nowanidonezidebuwas.pdfIn PDF document text
    • http://frchem.cn/upload/files/91749679475.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0d9c91b4c4cfe1aed92bb2e614aec601/58804896408.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/41651180856.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109080533078986.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/polojiboxapufedixopid.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132fef7f2f36---38238840780.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613abc7216634---pijebivud.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/14268092178.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/3051269239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dls+2020+mod+apk+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 19540 bytes
SHA-256: 34da386b86fe41e324904707acfad4dee46aecbc946690a6a5c3c3930d365c39
font_02_sfnt_off00013373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13373 10892 bytes
SHA-256: da15783d9b5efb42af8a1b9cad8ad018d3c5530e7320cdbb36640f85db1d7b45